Answer:
0.693kg of CuFeS2 is needed to produce 240 grams of Cu.
Explanation:
In 1 mole of CuFeS2 is associated 1 mole of Cu.
Molar mass of CuFeS2 = 183.5 g/mol
Molar mass of Cu = 63.5g/mol
No of moles of copper present in 240g of chalcopyrite = 240/63.5 = 3.779moles
we know
1 mole of Cu → 1 mole of CuFeS2
in 3.779 moles of Cu → 3.779 moles of CuFeS2
3.779 moles of CuFeS2 = 3.779 * 183.5 = 693.45grams
CuFeS2 in kg = 0.693kg
Explanation:
water near where a river enters the ocean is having a higher density.
coz, ocean water has salt which increases water's density
Earthquakes are created when tectonic plates rub, push, or pass each other. Tsunamis are made by earthquakes on the sea floor.
Answer:
Ca^2+
Explanation:
As we know, more energy is required to remove an electron from a positively charged ion than is required to remove an electron from a neutral atom. Hence, the second ionization energy of calcium is greater than its first ionization energy.
However, the third and fourth ionization energies of calcium are much higher than the second ionization energy because they involve removal of electrons from an inner filed shell. This process requires a lot of energy and is often not feasible.
Hence, the most common ion of calcium must be Ca^2+ where only two electrons are removed from calcium.
Answer:
The answer to your question is 0.13 M
Explanation:
Data
[HNO₃] = ?
moles of HNO₃ = 9.8 x 10⁻²
volume = 705 ml
Process
1.- Convert volume to milliliters
1000 ml ------------------ 1 L
705 ml ------------------ x
x = (705 x 1) / 1000
x = 705 / 1000
x = 0.75 L
2.- Calculate the molarity
Molarity = moles / volume
Molarity = 9.8 x 10⁻² / 0.75
Molarity = 0.13
